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Ah ha! The present owner of the bike is staying with me next week. The bike is/was a 1985 K100RS, which came to me through BMW as a standard bike. We did a little work on it, including trying different gearing (changed axle ratios)and a Nivomat rear shocker.
It ran fairly well, but never faster than 137mph flat out.
I finished 7th, less than a second behind Dave Leach on a Kawasaki.
Handling was interesting to say the least, but I have ridden some pretty ill handling bikes around the TT course.
Anything else you need to know? No I can't guess what you're up to!!